Hybrid quantum computing with ancillas. Issue 4 (1st October 2016)

• Record Type: Journal Article
• Authors: Proctor, Timothy J.; Kendon, Viv
• Is Part Of: Contemporary physics. Volume 57:Issue 4(2016)
• Page Start: 459
• Page End: 476
• Publication Date: 2016-10-01
• Subjects: Quantum computer -- quantum bus -- ancilla -- hybrid -- qudit -- continuous variable; Physics -- Periodicals; 530
• DOI: 10.1080/00107514.2016.1152700
• Languages: English
• ISSNs: 0010-7514

Abstract

Abstract : In the quest to build a practical quantum computer, it is important to use efficient schemes for enacting the elementary quantum operations from which quantum computer programs are constructed. The opposing requirements of well-protected quantum data and fast quantum operations must be balanced to maintain the integrity of the quantum information throughout the computation. One important approach to quantum operations is to use an extra quantum system – an ancilla – to interact with the quantum data register. Ancillas can mediate interactions between separated quantum registers, and by using fresh ancillas for each quantum operation, data integrity can be preserved for longer. This review provides an overview of the basic concepts of the gate model quantum computer architecture, including the different possible forms of information encodings – from base two up to continuous variables – and a more detailed description of how the main types of ancilla-mediated quantum operations provide efficient quantum gates.